JP5046087B2 - Motor control device - Google Patents

Description

  The present invention relates to a motor control device such as an inverter device or a servo amplifier that mainly operates with a high-voltage power supply, and more particularly to a cooling structure for increasing the heat dissipation effect of a reactor of the motor control device.

Conventionally, a motor control device has a built-in reactor that generates heat, and it has been necessary to effectively cool the reactor (see, for example, Patent Document 1). In, for example, an inverter device including the reactor, a part of the cooling air of the cooling fan that sends the cooling air to the heat sink that cools the power semiconductor module that generates high heat is directly applied to the coil 21 of the reactor 20 as shown in FIG. It had a structure to cool it against. In FIG. 5, reference numeral 22 denotes a core of the reactor 20.
JP 2005-323443 A

However, the reactor cooling method used in the conventional motor control device has the following problems.
That is, when the heat generating part of the motor control device is exposed to the outside of the panel, the environment outside the panel is bad and oil mist, iron powder or the like is sprayed on the coil 21. For this reason, the coil 21 may be damaged, eroded or short-circuited.
For this reason, even when the heat generating part is exposed to the outside of the control panel, the reactor must be arranged inside the motor control device main body, and it is necessary to increase the size of the reactor and install an internal stirring fan. There was a limit to realizing it.
The present invention has been made in view of such problems, and a motor capable of reducing the cost and reducing the size of the entire apparatus with a simple structure without increasing the size of a reactor or installing an internal cooling fan. An object is to provide a control device.

In order to solve the above problems, the present invention is configured as follows.
The invention according to claim 1 is in close contact with a housing of the motor control device, a heat sink disposed in the housing and provided with fins, a cooling fan for cooling the heat sink, and a surface of the heat sink on the side opposite to the fin. A power semiconductor module; a reactor having a core disposed on a fin side of the heat sink in the housing; and a coil housed in the core and having a coil end protruding from a longitudinal end portion of the core. In the motor control device provided in the body, the surface of the coil includes a heat sink for the reactor that is brought into contact via a heat transfer resin, and a coil cover disposed beside the longitudinal end of the coil end ,
Further, the reactor heat sink passes through the core, protrudes from both ends in the longitudinal direction, and is in contact with the atmosphere .
The invention according to claim 2 is characterized in that the heat sink for the reactor is in contact with the surface of the side portion in the longitudinal direction of the coil via a heat transfer resin.
According to a third aspect of the present invention, the reactor heat sink is configured in a linear shape that penetrates the inside of the core and contacts both sides of the coil in the width direction, and the coil cover is supported by the reactor heat sink. It is characterized by being.
The invention according to claim 4 is characterized in that the coil cover includes a cover attaching portion attached to the housing and a coil end cover portion rising from the cover attaching portion. is there.
The invention according to claim 5 is characterized in that the coil end cover portion is configured in an L-shaped cross section including a coil end cover portion that rises substantially vertically from the cover mounting portion. .
The invention according to claim 6 is characterized in that the casing is installed with the longitudinal direction of the core of the reactor as the vertical direction, and the coil end cover portion is inclined with respect to the longitudinal direction of the core. To do.
The invention according to claim 7 is characterized in that the coil cover is formed of a heat sink and is in contact with the surface of the longitudinal end of the coil end via a heat transfer resin.
The invention according to claim 8 is characterized in that the coil end side surface of the coil cover is formed in an arc shape matching the arc of the coil end.
The invention according to claim 9 is characterized in that the coil cover has fins.

The present invention has the following effects.
According to invention of Claim 1, 2, since the heat sink for reactors is made to contact the surface of the longitudinal direction side part of the coil accommodated in the core of the reactor via heat transfer resin, it generate | occur | produces in the said coil Heat can be transmitted to the heat sink, and the coil can be effectively cooled.
In addition, since the heat sink for the reactor penetrates the inside of the core and protrudes from both ends in the longitudinal direction and touches the atmosphere, the heat transferred from the coil to the heat sink is directly radiated into the atmosphere, The coil can be cooled more effectively.
Furthermore, since the coil cover is brought into contact with the surface of the coil end protruding from the longitudinal end of the core via the heat transfer resin, oil mist, iron powder, and the like are not sprayed onto the coil. Therefore, the coil can be protected without being damaged, eroded, or short-circuited. Further, since the heat of the coil is transmitted to the coil cover via the heat transfer resin, the coil can be cooled.
According to the invention described in claim 3, the heat sink for the reactor is configured in a linear shape that penetrates the inside of the core and contacts both sides of the coil in the width direction, and the coil cover is supported by the heat sink for the reactor. Therefore, the arc-shaped periphery of the coil end of the coil can be effectively covered, and the coil 7b is protected from damage, erosion, short circuit, and the like.
According to invention of Claim 4, 5, the said coil cover is a cross-section L-shape provided with the cover attachment part attached to the said housing | casing, and the coil end cover part which stands | starts up substantially perpendicularly from the said cover attachment part. Since it is comprised, the said coil cover can be attached to a housing | casing in the state brought close to the coil end simply and reliably.
According to invention of Claim 6, the said housing | casing is installed by making the longitudinal direction of the core of the said reactor into the up-down direction, and the coil end cover part of the said coil cover is made with respect to the longitudinal direction of the said core in that case Since it is inclined, even when oil mist or iron powder adheres to the coil end cover portion, the oil mist or iron powder is naturally dropped and removed by gravity due to the inclined attachment surface.
According to the seventh aspect of the present invention, the coil cover is constituted by a heat sink, and is brought into contact with the surface of the longitudinal end portion of the coil end via the heat transfer resin, so that the cooling of the coil is further improved. Done.
According to the eighth aspect of the present invention, since the coil end side surface of the coil cover is formed in an arc shape that matches the arc of the coil end, the contact area between the coil cover made of a heat sink and the coil end increases. The coil is cooled very well.
According to the ninth aspect of the present invention, since the coil cover made of the heat sink has fins, the heat radiation from the coil cover is further improved, and the coil is cooled extremely well.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a motor control device according to a first embodiment of the present invention. In order to show the internal structure in an easy-to-understand manner, the casing is indicated by a one-dot chain line. FIG. 2 is a side sectional view showing a state where the motor control device in FIG. 1 is installed with the cooling fan on the top side (upper side). 3A and 3B are views showing the reactor in FIG. 1, in which FIG. 3A is a perspective view of the whole, and FIG. 3B is a perspective view of a coil cover.
1 to 3, reference numeral 1 denotes a motor control device such as an inverter, and 2 denotes a housing of the motor control device 1, which is provided with an intake port 2 a and an exhaust port 2 b at an end portion in the longitudinal direction and a ventilation hole 2 c at a side portion. It has. The motor control device 1 is installed inside a control panel, for example, with the intake port 2a of the housing 2 on the lower side and the exhaust port 2b on the upper side (top side). Reference numeral 3 denotes a heat sink composed of a heat sink body 3a and fins 3b, and a power semiconductor module 4 including an IGBT element or the like is brought into close contact with the surface on the side opposite to the fin of the heat sink body 3a. Reference numeral 5 denotes a cooling fan, which is arranged at the upper part of the casing 2 and allows cooling air to flow from the lower side to the upper side. Reference numeral 6 denotes an electrolytic capacitor, which is disposed between the intake port 2b that is on the windward side and the heat sink 3. 7 is a reactor, a rectangular parallelepiped core 7a disposed on the fin 3b side of the heat sink 3 in the housing 2, and a coil housed in the core 7a with a coil end 7c protruding from the longitudinal end of the core 7b. 8 is a heat sink for the reactor made of aluminum, which penetrates between the core 7a and the coil 7b inside the core 7a of the reactor 7 and protrudes from both ends in the longitudinal direction of the core 7a to be exposed to the atmosphere. The reactor heat sink 8 is formed in a linear shape that contacts both sides of the coil 7b in the width direction via a heat transfer resin (potting resin) 9 respectively. Moreover, the fin 8a is formed in the surface of the outer side of the part protruded from the longitudinal direction both ends of the said core 7a at least. Reference numeral 10 denotes a coil cover, which is arranged beside the surface of the longitudinal end of the coil end 7c. The coil cover 10 is configured to have an L-shaped cross section including a cover attaching portion 10a attached to the housing 2 with, for example, a screw 11 and a coil end cover portion 10b rising substantially vertically from the cover attaching portion 10a. Also, cover support portions 10c that are attached to the surface on the side opposite to the fin of the reactor heat sink 8 are provided on both the left and right sides of the coil end cover portion 10b.

In such a configuration, the cooling of the reactor 7 and the protection of the coil in the motor control device 1 are performed as follows.
As shown in FIG. 2, the motor control device 1 is installed in a control panel (not shown) such that the cooling fan 5 is at the top. When the motor control device 1 is driven, the coil 7 b of the reactor 7 generates heat together with the power semiconductor module 4 and the electrolytic capacitor 6. The heat generated in the reactor 7 is transmitted to the core 7a that contacts the upper and lower surfaces of the coil 7b and the reactor heat sink 8 that contacts both side surfaces via the heat transfer resin 9. In particular, in the heat sink 8 for the reactor, the heat of the coil 7b is transmitted very well.
The cooling fan 5 is driven to cool the motor control device 1 together with the driving of the motor control device 1 or at an appropriate time, and the cooling air flows in the housing 2 from the lower side toward the upper side. . The cooling air directed toward the reactor 7 contacts the coil cover 10 that covers the coil end 7c of the reactor 7 and the reactor heat sink 8, and also contacts the core 7a that covers the linear portion of the coil 7b. At that time, the lower end (opposite side) longitudinal end surface of the coil end 7c to which the cooling air has been directly blown is covered with the coil cover 10, so that oil mist, iron powder, etc. are blown with the cooling air. It is never done. Therefore, the coil 7b is protected from damage, erosion, short circuit, and the like. Since the longitudinal end surface on the upper side (top side) of the coil end 7c is also covered with the coil cover 10, it adheres to the coil end 7c when oil mist or iron powder blown up by the cooling fan 5 falls. There is no. Therefore, the coil 7b is protected from damage, erosion, short circuit, and the like.
Further, the cooling air contacts the core 7a that contacts the front surface and the back surface of the coil 7b and the reactor heat sink 8 that contacts both sides of the coil 7b via the heat transfer resin 9, so that heat can be exchanged between them. This is done and the reactor 7 is effectively cooled.

4A and 4B are views showing a reactor in a second embodiment of the present invention, in which FIG. 4A is a perspective view of the whole, and FIG. 4B is a perspective view of a coil cover.
In the present embodiment, the coil cover 10 is constituted by a heat sink, and is in contact with the surface of the end portion in the longitudinal direction of the coil end 7 c via a heat transfer resin 9. As a result, heat is transmitted from the coil end 7c to the coil cover 10, and the coil is further cooled.
In addition, the coil cover 10 has fins 10d formed on the outer surface to improve heat dissipation from the coil cover 10, and is inclined with respect to the longitudinal direction of the core 7a so that oil mist is formed on the coil cover. Even when iron powder or iron powder adheres, the inclined adhesion surface allows oil mist and iron powder to fall and be removed naturally by gravity.
Further, when the coil cover 10 is constituted by a heat sink, if the surface of the coil cover 10 on the coil end side is formed in an arc shape matching the arc of the coil end 7c, the coil cover 10 made of a heat sink. The contact area between the coil end 7c increases and heat transfer from the coil end 7c to the coil cover 10 is further improved.
In the present invention, the coil cover 10 may be inclined with respect to the longitudinal direction of the core 7a even when the coil cover 10 is not formed of a heat sink. Also in this case, when oil mist or iron powder adheres to the coil cover 10, the oil mist or iron powder is naturally dropped and removed by gravity by the inclined attachment surface.

It is a perspective view which shows the motor control apparatus in 1st Example of this invention. In order to show the internal structure in an easy-to-understand manner, the casing is indicated by a one-dot chain line. FIG. 2 is a side sectional view showing a state where the motor control device in FIG. 1 is installed with the cooling fan on the top side (upper side). It is a figure which shows the reactor in FIG. 1, (a) is a perspective view of the whole, (b) is a perspective view of a coil cover. It is a figure which shows the reactor in 2nd Example of this invention, (a) is a perspective view of the whole, (b) is a perspective view of a coil cover. It is a perspective view which shows the reactor of the motor control apparatus in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor controller 2 Case 2a Intake port 2b Exhaust port 2c Ventilation hole 3 Heat sink 3a Heat sink body 3b Fin 4 Power semiconductor module 5 Cooling fan 6 Electrolytic capacitor 7 Reactor 7a Core 7b Coil 7c Coil end 8 Reactor heat sink 8a Fin 9 Transmission Thermal resin 10 Coil cover 10a Cover mounting portion 10b Coil end cover portion 10c Cover support portion 10d Fin 11 Screw

Claims (9)

A motor control device housing;
A heat sink disposed in the housing and provided with fins;
A cooling fan for cooling the heat sink;
A power semiconductor module in close contact with the surface of the heat sink opposite to the fin;
A motor having a core disposed on the fin side of the heat sink in the casing and a reactor housed in the core and having a coil with a coil end protruding from a longitudinal end of the core. In the control device,
A heat sink for a reactor brought into contact with the surface of the coil via a heat transfer resin;
A coil cover disposed beside the longitudinal end of the coil end ,
Furthermore, the reactor heat sink passes through the inside of the core, protrudes from both ends in the longitudinal direction, and is in contact with the atmosphere .   The motor control device according to claim 1, wherein the reactor heat sink is in contact with a surface of a longitudinal side portion of the coil via a heat transfer resin.   2. The reactor heat sink is configured in a straight line that penetrates through the core and contacts both sides of the coil in the width direction, and the coil cover is supported by the reactor heat sink. The motor control device described in 1.   The motor control device according to claim 3, wherein the coil cover includes a cover attaching portion attached to the housing and a coil end cover portion rising from the cover attaching portion.     5. The motor control device according to claim 4, wherein the coil end cover portion is configured in an L-shaped cross section including a coil end cover portion that rises substantially vertically from the cover mounting portion.   The motor control according to claim 3, wherein the casing is installed with a longitudinal direction of a core of the reactor as a vertical direction, and the coil end cover portion is inclined with respect to a longitudinal direction of the core. apparatus.   The motor control device according to claim 1, wherein the coil cover is formed of a heat sink and is in contact with a surface of a longitudinal end portion of the coil end via a heat transfer resin.   The motor control device according to claim 6, wherein a surface on the coil end side of the coil cover is formed in an arc shape matching the arc of the coil end.   The motor control device according to claim 7, wherein the coil cover has fins.

Images